CN212465957U

CN212465957U - Fundus camera

Info

Publication number: CN212465957U
Application number: CN202020326060.3U
Authority: CN
Inventors: 陈善球; 程波涛; 李磊; 管鹏程; 王梦雅; 李利磊; 李超宏
Original assignee: Suzhou Microclear Medical Instruments Co ltd
Current assignee: Suzhou Microclear Medical Instruments Co ltd
Priority date: 2020-03-17
Filing date: 2020-03-17
Publication date: 2021-02-05
Anticipated expiration: 2030-03-17

Abstract

The utility model provides an eye ground camera, include: the lens assembly is used for converging imaging light reflected by the fundus and comprises a first lens group and a second lens group which are sequentially arranged from the fundus side to the imaging side; the illuminating assembly is arranged between the first lens group and the second lens group and comprises N first light-emitting elements for emitting visible light and N second light-emitting elements for emitting infrared light, the N first light-emitting elements and the N second light-emitting elements are concentric and arranged at intervals, the optical axis of the lens assembly penetrates through the center of the circle, and N is an integer greater than 3; and an imaging assembly that generates a fundus image from the imaging light condensed by the lens assembly. Compared with the prior art, the utility model discloses the illumination of eye ground camera is even to make imaging sensor sensitization even, and then improved the imaging quality.

Description

Fundus camera

Technical Field

The utility model relates to an eye ground camera especially relates to an even eye ground camera of illumination.

Background

A hand-held eye fundus camera belongs to the field of medical imaging, and is used for acquiring a human eye retina image so as to facilitate medical staff to check eye fundus diseases or assist the medical staff to judge the state of illness of other organs. Since the blood vessels of the fundus are the only blood vessels that can be directly observed by the human body through the body surface, medical personnel can check whether the optic nerve, retina, choroid and refraction medium of the fundus have pathological changes through the fundus camera, and can also assist in diagnosing and judging the disease conditions of other system diseases through the fundus camera, for example, screening retinal pictures to detect cerebral infarction, cerebral hemorrhage, cerebral arteriosclerosis, brain tumors, diabetes, nephropathy, hypertension, retinopathy of prematurity, glaucoma, age-related macular degeneration and the like. Since the earlier detection of these diseases is more advantageous for clinical treatment, fundus cameras are widely used for clinical screening of fundus diseases, and are indispensable medical instruments.

In order to reduce the volume of a handheld fundus camera, existing handheld fundus cameras employ off-axis illumination sources, namely: the illumination source is offset from the optical axis of the imaging lens system. However, this approach has non-uniform illumination, which results in non-uniform light sensing of the imaging sensor, which results in lower imaging quality.

In view of the above, it is necessary to provide a fundus camera to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an eye ground camera, this eye ground camera illumination is even to make imaging sensor sensitization even, and then improved the imaging quality.

In order to achieve the above object, the present invention provides an eye fundus camera, including: the lens assembly is used for converging imaging light reflected by the fundus and comprises a first lens group and a second lens group which are sequentially arranged from the fundus side to the imaging side; the illuminating assembly is arranged between the first lens group and the second lens group and comprises N first light-emitting elements for emitting visible light and N second light-emitting elements for emitting infrared light, the N first light-emitting elements and the N second light-emitting elements are concentric and arranged at intervals, the optical axis of the lens assembly penetrates through the center of the circle, and N is an integer greater than 3; and an imaging assembly that generates a fundus image from the imaging light condensed by the lens assembly.

As a further improvement of the present invention, the length of the first light emitting element in the circumferential direction of the circle is L1, and the length of the second light emitting element in the circumferential direction of the circle is L2; the distance between the adjacent first light-emitting elements and second light-emitting elements is L3; l1 is less than or equal to L3, and L2 is less than or equal to L3.

As a further improvement of the present invention, L1 is L2 is 2L 3.

As a further improvement of the present invention, N is 4.

As a further improvement of the present invention, N is 6.

As a further improvement of the present invention, the lighting assembly includes a polarizer cooperating with the first light emitting element or the second light emitting element.

As a further improvement of the present invention, the fundus camera further includes a display unit that displays a fundus image.

As a further improvement of the present invention, the fundus camera further includes a storage unit that stores a fundus image.

As a further improvement of the present invention, the fundus camera further comprises adjusting the lens assembly or the imaging assembly to follow the focusing assembly where the optical axis moves.

As a further improvement of the present invention, the first lens group is a biconvex aspheric lens.

The utility model has the advantages that: the utility model discloses the illumination of eye ground camera is even to make imaging sensor sensitization even, and then improved the imaging quality.

Drawings

Fig. 1 is a schematic block diagram of the fundus camera of the present invention.

Fig. 2 is a schematic view of the structure of the illumination assembly.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 and 2, the present invention discloses an eye fundus camera 100, which includes a lens assembly 10, an illumination assembly 20 and an imaging assembly 30.

Referring to fig. 1, the lens assembly 10 is used for converging imaging light reflected by a fundus, and includes a first lens group 11 and a second lens group 12 sequentially arranged from the fundus side to the imaging side. In the present embodiment, the first lens group 11 is a single biconvex aspherical mirror, but in other embodiments, the first lens group 11 may be formed by combining a plurality of lenses. The illumination assembly 20 is disposed between the first lens group 11 and the second lens group 12. Referring to fig. 2, the lighting assembly 20 includes N first light emitting devices 21 emitting visible light and N second light emitting devices 22 emitting infrared light. The N first light emitting elements 21 and the N second light emitting elements 22 are concentric and spaced apart from each other, and an optical axis OA of the lens assembly 10 passes through a center of the circle. And N is an integer greater than 3. In this embodiment, N is 4, but in other embodiments, N may also be 5 or 6. The three configuration modes can not only meet the requirement of small volume of the handheld fundus camera, but also realize uniform illumination to the maximum extent. Referring to fig. 2, the length of the first light emitting element 21 in the circumferential direction of the circle is L1, the length of the second light emitting element 22 in the circumferential direction of the circle is L2, the distance between the adjacent first light emitting element 21 and the adjacent second light emitting element 22 is L3, L3 is equal to or greater than L1, and L3 is equal to or greater than L2. Preferably, the L1-L2-2L 3 is configured to effectively balance the minimum size of the circle and the heat dissipation efficiency of the first light emitting element 21 and the second light emitting element 22. Preferably, the lighting assembly 20 is further provided with a polarizer (not shown) cooperating with the first light emitting element 21 or the second light emitting element 22.

The imaging assembly 30 generates a fundus image from the imaging light collected by the lens assembly 10. The imaging assembly 30 may be a CMOS image sensor or the like, and the present invention is not particularly limited to the specific configuration of the imaging assembly 30. Preferably, the fundus camera 100 may further include a display unit (not shown) that displays a fundus image, a storage unit (not shown) that stores the fundus image, and a focusing assembly (not shown). It will be appreciated that the focusing assembly may adjust the movement of the lens assembly 10 or the imaging assembly 30 along the optical axis OA.

Compared with the prior art, the utility model discloses 100 illuminations of eye ground camera are even to make imaging sensor sensitization even, and then improved the imaging quality.

The above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A fundus camera, comprising:

the lens assembly is used for converging imaging light reflected by the fundus and comprises a first lens group and a second lens group which are sequentially arranged from the fundus side to the imaging side;

the illuminating assembly is arranged between the first lens group and the second lens group and comprises N first light-emitting elements for emitting visible light and N second light-emitting elements for emitting infrared light, the N first light-emitting elements and the N second light-emitting elements are concentric and arranged at intervals, the optical axis of the lens assembly penetrates through the center of the circle, and N is an integer greater than 3; and

an imaging assembly that generates a fundus image from the imaging light collected by the lens assembly.

2. The fundus camera of claim 1, wherein: a length of the first light emitting element in the circumferential direction of the circle is L1, and a length of the second light emitting element in the circumferential direction of the circle is L2; the distance between the adjacent first light-emitting elements and second light-emitting elements is L3; l1 is less than or equal to L3, and L2 is less than or equal to L3.

3. The fundus camera of claim 2, wherein: l1 ═ L2 ═ 2L 3.

4. The fundus camera of claim 1, wherein: and N is 4.

5. The fundus camera of claim 1, wherein: and N is 6.

6. The fundus camera of claim 1, wherein: the lighting assembly includes a polarizer cooperating with the first or second light emitting element.

7. The fundus camera of claim 1, wherein: the fundus camera further includes a display unit that displays a fundus image.

8. The fundus camera of claim 1, wherein: the fundus camera further includes a storage unit that stores a fundus image.

9. The fundus camera of claim 1, wherein: the fundus camera also includes a focusing assembly that adjusts movement of the lens assembly or imaging assembly along the optical axis.

10. The fundus camera of claim 1, wherein: the first lens group is a biconvex aspheric lens.